JOURNAL 



OF 



NATURAL PHILOSOPHY, 

 CHEMISTRY, 



AND 



THE ARTS, 



VOL. XI. 



3iHustrateD toitt) engravings* 



BY WILLIAM NICHOLSON. 



LONDON: 



PRINTED BY W. STRATFORD, CR<?WN COURT, TCHPLS BAR i »0R 



THE AUTHOR, 



AKD SOl^P BY HIM AT NO. 10, SOHO-S<lUARK ; 

 AND BY 

 J. MURRAY, NO. 32, FLEET-8TREET* 



1805, 



